#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
	int fdSrc;

	char *readBuf=NULL;

	if(argc != 2){
		printf("pararm error\n");
		exit(-1);
	}
	
	

	fdSrc = open(argv[1],O_RDWR);
	int size = lseek(fdSrc,0,SEEK_END);
	lseek(fdSrc,0,SEEK_SET);

	readBuf=(char *)malloc(sizeof(char)*size + 8);

	int n_read = read(fdSrc, readBuf, size);
	
	char *p = strstr(readBuf,"HANG = ");
	if(p==NULL){
		printf("not found\n");
		exit(-1);
	}
	
	p = p+strlen("LENG = ");
	*p = '6';
	
	
	
	lseek(fdSrc,0,SEEK_SET);
	int n_write = write(fdSrc,readBuf,strlen(readBuf));

	
	close(fdSrc);

	return 0;
}

